Evaluate Mathematical Expressions

You are given a set of mathematical expressions. Each expression consists of two integer operands and an operator separated by spaces. The valid operators are +, -, *, and /. Your task is to evaluate each expression and output the result. The division operator performs floating‐point division. If the expression is invalid, you must return a specific error message.

The evaluation rules are as follows:

• If the expression has exactly three components (operand operator operand), evaluate it.
• If the operator is +, -, *, or /, perform the respective operation.
• If the operator is / and division by zero is attempted, output Error: Division by zero.
• If the operator is not one of the valid ones, output Error: Invalid operator 'op' (where op is the provided operator).
• If the syntax is not exactly in the required format, output Error: Invalid syntax.

All numerical results (even when whole numbers) should be printed as floats if computed via division. You should read input from stdin and write output to stdout.

inputFormat

The first line contains an integer T (T ≥ 1), representing the number of expressions. Each of the following T lines contains a mathematical expression in the format: "operand operator operand" with a single space between tokens.

outputFormat

For each expression, output a single line with the evaluated result or the corresponding error message.## sample

1
3 + 5

8.0